Thank you for your response!

I’m still having some difficulty diagnosing the issue, but I now have more context. When the sub-accounts were linked to the master account, it seems that all the transactions were merged, which explains the duplicates for every transaction. Before setting up the parent and sub-accounts, our master account recorded expenses from both cards and our credit card payments, so I only reconciled the master account. I never reconciled the individual card accounts, even before they were converted into sub-accounts. When I was voiding duplicates, I only voided those from the sub-accounts, not the master account—specifically, the ones that had already been reconciled.

I checked the audit log, but it didn’t provide any new information, only that I had edited transactions to zero them out, which I was already aware of. I'm happy to answer any questions if more context is needed.

Do you have any additional advice or suggestions for resolving this issue?